SN 1998bw
Type Ic
Date26 April 1998
ConstellationTelescopium
Right ascension19h 35m 03.30s
Declination−52° 50′ 45.9″
Galactic coordinates344.99°, −27.72°
Redshift0.0085 Edit this on Wikidata
HostESO 184-G82
Other designationsSN 1998bw, AAVSO 1927-53, GRB 980425
[edit on Wikidata]

SN 1998bw was a rare broad-lined Type Ic[1] gamma ray burst supernova detected on 26 April 1998 in the ESO 184-G82 spiral galaxy, which some astronomers believe may be an example of a collapsar (hypernova).[2] The hypernova has been linked to GRB 980425, which was detected on 25 April 1998, the first time a gamma-ray burst has been linked to a supernova.[3] The hypernova is approximately 140 million light years away, very close for a gamma ray burst source.[4]

The region of the galaxy where the supernova occurred hosts stars 5-8 million years old and is relatively free from dust. A nearby region hosts multiple Wolf-Rayet stars less than 3 million years old, but it is unlikely that the supernova progenitor could be a runaway from that region. The implication is that the progenitor was a star originally 25-40 M☉ if it exploded as a single star at the end of its life.[5]

References

  1. ^ Woosley, S. E.; Eastman, Ronald G.; Schmidt, Brian P. (1999). "Gamma-Ray Bursts and Type Ic Supernova SN 1998bw" (PDF). The Astrophysical Journal. 516 (2): 788–796. arXiv:astro-ph/9806299. Bibcode:1999ApJ...516..788W. doi:10.1086/307131. hdl:1885/94504. S2CID 17690696. Archived from the original (PDF) on 2016-09-18. Retrieved 2014-12-03.
  2. ^ "Gamma-ray Burst 980425". Retrieved June 11, 2017.
  3. ^ Vreeswijk, P.; Tanvir, N.; Galama, T. (2000). "Gamma-Ray Burst Afterglows: Surprises from the Sky". The ING Newsletter. 2: 5. Bibcode:2000INGN....2....5V. Retrieved 2014-08-27.
  4. ^ "A Strange Supernova with a Gamma-Ray Burst". European Southern Observatory. Retrieved 2015-11-14.
  5. ^ Krühler, Thomas; Kuncarayakti, Hanindyo; Schady, Patricia; Anderson, Joseph P.; Galbany, Lluís; Gensior, Jindra (2017). "Hot gas around SN 1998bw - Inferring the progenitor from its environment". Astronomy & Astrophysics. 602 (85): A85. arXiv:1702.05430. Bibcode:2017A&A...602A..85K. doi:10.1051/0004-6361/201630268. S2CID 54903796.

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